If you're the super oblivious type, you might not even know an animal is into you unless they're incessantly humping your leg. Here are some subtle signs that an animal might want you as more than just a friend.
This dog wants to know where you've been all his life.
This cat logged on at 3am just to cyber with you.
Source: http://24.media.tumblr.com/tumblr_lzbbcvtb571r3pq84o5_1280.png
This seal hasn't seen a fine piece of tail like you around these waters in quite some time.
Source: bcx.org
This dog got all dressed up because she knew you'd be here tonight.
Source: catsbeaversandducks
